App note from Vishay about their resistors with special wire termination which are used in automotive application such as sensors for engine knock , crankshaft and liquid level. Link here (PDF)
As the electronic contents in automobiles are growing, there is increasing demand of electronic assemblies, such as sensors, to meet specific application requirements.
The overall sensor market is driven by an increased need for safety, reliability, efficiency, comfort, and protection from harsh environment.
Vishay Draloric / Beyschlag offers the MBA/SMA 0204 metal film resistors with special wire terminations, which can be either welded or soldered. Traditionally, the resistors are used on the PCB. However, sensor applications require welding or soldering of resistors on lead frames. The special termination wire material includes coppered steel (FeCu), nickel (Ni), and coppered silver (CuAg).
These resistors also exhibit superior TCR for such under the hood (high temperature) applications, excellent long term stability under harsh operating conditions, mechanical robustness in terms of high tensile strength, and high electrical conductivity of the special wires.